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1 #!/usr/bin/python | 1 # Copyright (c) 2011 The Chromium Authors. All rights reserved. |
2 # | |
3 # Copyright (c) 2012 The Chromium Authors. All rights reserved. | |
4 # Use of this source code is governed by a BSD-style license that can be | 2 # Use of this source code is governed by a BSD-style license that can be |
5 # found in the LICENSE file. | 3 # found in the LICENSE file. |
6 | 4 |
7 """A wrapper for subprocess to make calling shell commands easier.""" | |
8 | |
9 | 5 |
10 import logging | 6 import logging |
11 import subprocess | 7 import subprocess |
12 | 8 |
13 | 9 |
14 def RunCmd(args, cwd=None): | 10 def RunCmd(args, cwd=None): |
15 """Opens a subprocess to execute a program and returns its return value. | 11 """Opens a subprocess to execute a program and returns its return value. |
16 | 12 |
17 Args: | 13 Args: |
18 args: A string or a sequence of program arguments. The program to execute is | 14 args: A string or a sequence of program arguments. The program to execute is |
19 the string or the first item in the args sequence. | 15 the string or the first item in the args sequence. |
20 cwd: If not None, the subprocess's current directory will be changed to | 16 cwd: If not None, the subprocess's current directory will be changed to |
21 |cwd| before it's executed. | 17 |cwd| before it's executed. |
22 | |
23 Returns: | |
24 Return code from the command execution. | |
25 """ | 18 """ |
26 logging.info(str(args) + ' ' + (cwd or '')) | 19 logging.info(str(args) + ' ' + (cwd or '')) |
27 p = subprocess.Popen(args=args, cwd=cwd) | 20 p = subprocess.Popen(args=args, cwd=cwd) |
28 return p.wait() | 21 return p.wait() |
29 | 22 |
30 | 23 |
31 def GetCmdOutput(args, cwd=None, shell=False): | 24 def GetCmdOutput(args, cwd=None): |
32 """Open a subprocess to execute a program and returns its output. | 25 """Open a subprocess to execute a program and returns its output. |
33 | 26 |
34 Args: | 27 Args: |
35 args: A string or a sequence of program arguments. The program to execute is | 28 args: A string or a sequence of program arguments. The program to execute is |
36 the string or the first item in the args sequence. | 29 the string or the first item in the args sequence. |
37 cwd: If not None, the subprocess's current directory will be changed to | 30 cwd: If not None, the subprocess's current directory will be changed to |
38 |cwd| before it's executed. | 31 |cwd| before it's executed. |
39 shell: Whether to execute args as a shell command. | |
40 | |
41 Returns: | |
42 Captures and returns the command's stdout. | |
43 Prints the command's stderr to logger (which defaults to stdout). | |
44 """ | 32 """ |
45 logging.info(str(args) + ' ' + (cwd or '')) | 33 logging.info(str(args) + ' ' + (cwd or '')) |
46 p = subprocess.Popen(args=args, cwd=cwd, stdout=subprocess.PIPE, | 34 p = subprocess.Popen(args=args, cwd=cwd, stdout=subprocess.PIPE, |
47 stderr=subprocess.PIPE, shell=shell) | 35 stderr=subprocess.PIPE) |
48 stdout, stderr = p.communicate() | 36 stdout, stderr = p.communicate() |
49 if stderr: | 37 if stderr: |
50 logging.critical(stderr) | 38 logging.critical(stderr) |
51 logging.info(stdout[:4096]) # Truncate output longer than 4k. | 39 logging.info(stdout[:4096]) # Truncate output longer than 4k. |
52 return stdout | 40 return stdout |
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